IRIS Pol. Torinohttps://iris.polito.itIl sistema di repository digitale IRIS acquisisce, archivia, indicizza, conserva e rende accessibili prodotti digitali della ricerca.Sun, 07 Jun 2020 10:29:38 GMT2020-06-07T10:29:38Z101121Effects of cutting angle, edge preparation, and nano-structured coating on milling performance of a gamma titanium aluminidehttp://hdl.handle.net/11583/2503396Titolo: Effects of cutting angle, edge preparation, and nano-structured coating on milling performance of a gamma titanium aluminide
Abstract: Gamma titanium aluminides are intermetallic alloys. Recently, they have been evaluated as
important contenders for structural applications in the automotive and aerospace sectors. This is due
to their excellent high-temperature performances and their significantly lower density compared to
Nickel-based superalloys. In this paper, an analysis of machinability of a gamma TiAl obtained via an
electron beam melting (EBM) process is presented. The effects of tool geometry modifications, in terms
of cutting tool angles and cutting edge preparation, were investigated. The reduction of radial rake
angle and the drag finishing process for cutting edge preparation resulted in an increase of the tool life
of the carbide end mills. Nanogradient tool coatings were also observed to affect tool wear during
milling tests, and the results highlight that AlSiTiN coating performs better compared to CrAlSiN
coating. A post-coating polishing treatment was also taken into account, and it allowed a further
reduction of tool wear. The overall results indicate that the machinability of this difficult-to-cut
material can be significantly improved by an adjustment of the cutting edge geometry, and by using an
AlSiTiN coating system.
Sun, 01 Jan 2012 00:00:00 GMThttp://hdl.handle.net/11583/25033962012-01-01T00:00:00ZPost-processing di materie plastiche e tecnologie di giunzionehttp://hdl.handle.net/11583/2709954Titolo: Post-processing di materie plastiche e tecnologie di giunzione
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/11583/27099542018-01-01T00:00:00ZDrilling experiments on a gamma titanium aluminide obtained via electron beam meltinghttp://hdl.handle.net/11583/2526284Titolo: Drilling experiments on a gamma titanium aluminide obtained via electron beam melting
Abstract: Gamma titanium aluminides are intermetallic structural alloys with many advantages like high temperature and oxidation resistance, low density, high specific strength, rigidity, etc. This makes them promising candidates for critical applications where both mechanical and thermal properties are required. Unfortunately, their machinability is demanding, generating low cutting life and poor surface conditions. A deeper knowledge on the machining parameters is essential for a wider application of these heat resistant light-weight alloys in aircraft and automotive industry. In this paper, the performance of uncoated carbide drills in drilling a gamma titanium aluminide was analysed. The workpiece material was obtained via electron beam melting (EBM) process, a versatile technology for additive manufacturing of complex metal parts from metal powders. EBM is highly appealing in the field of aeroengine components, and it is particularly interesting in processing gamma titanium aluminides. Cutting performances were measured in terms of tool wear, surface roughness, dimensional and geometric errors. The experimental results show strong dependence of tool wear and part quality on cutting parameters, with poor tool life compared with other work materials.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/11583/25262842013-01-01T00:00:00ZMassimo raffreddamento, massime prestazionihttp://hdl.handle.net/11583/2526295Titolo: Massimo raffreddamento, massime prestazioni
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/11583/25262952013-01-01T00:00:00ZAn evaluative approach to correlate machinability, microstructures, and material properties of gamma titanium aluminideshttp://hdl.handle.net/11583/2543088Titolo: An evaluative approach to correlate machinability, microstructures, and material properties of gamma titanium aluminides
Abstract: Several generations of gamma titanium aluminides have been developed over time, and they are nowadays commercially available. The differences in chemical composition, as well as the thermal treatments, greatly influence the properties of the alloys. This implies considerable effects on the production process performances. Benchmark trials were performed on three γ-TiAl alloys: Ti–48Al–2Cr–2Nb, Ti–43.5Al–4Nb–1Mo–0.1B, and Ti–45Al–2Nb–2Mn + 0.8 vol.% TiB2 XD, focusing on machinability and material characterization. The extremely dissimilar results obtained when turning and milling can be traced back to the different microstructures, as well as to the alloying elements, factors both affecting the mechanical and thermal material properties.
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/11583/25430882014-01-01T00:00:00ZEsperienze di lubrificazione minimale in fresaturahttp://hdl.handle.net/11583/2526296Titolo: Esperienze di lubrificazione minimale in fresatura
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/11583/25262962013-01-01T00:00:00Z2014http://hdl.handle.net/11583/2526293Titolo: 2014
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/11583/25262932013-01-01T00:00:00ZSurface characterization and machinability of Zirconium alloys in view of jewelry applicationhttp://hdl.handle.net/11583/2545740Titolo: Surface characterization and machinability of Zirconium alloys in view of jewelry application
Abstract: The jewelry making has been traditionally considered handcrafted and hinged on the ability
of goldsmiths to create components and assemblies. In recent years, however, a profound
transformation has begun, driven by the global markets requiring robust engineering approaches to
the analysis of new materials and of product/process optimization. Moreover, gold and silver were
conventionally associated to the jewelry production, but the use of materials other than precious
metals (such as steels, titanium alloys, woods and ceramics) is nowadays a standard for many
companies. In this context, the research activities presented and described in this paper focus on the
performance evaluation of a Zirconium alloy, in terms of material properties and machinability, for
the application in the jewelry industry. Perspiration, salt spray and abrasion tests provided results
comparable or even superior to those typical of a Ti-6Al-4V alloy, especially in case a Zirconia layer
is induced on the Zirconium alloy through a properly designed oxidizing treatment. Machinability can
be performed with conventional tools and equipment, and the production route of jewel prototypes is
detailed.
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/11583/25457402014-01-01T00:00:00ZEvaluation of the Environmental Impact of different Lubrorefrigeration Conditions in Milling of -TiAl Alloyhttp://hdl.handle.net/11583/2460383Titolo: Evaluation of the Environmental Impact of different Lubrorefrigeration Conditions in Milling of -TiAl Alloy
Sat, 01 Jan 2011 00:00:00 GMThttp://hdl.handle.net/11583/24603832011-01-01T00:00:00ZThe Role of re-design for Additive Manufacturing on the Process Environmental Performancehttp://hdl.handle.net/11583/2706805Titolo: The Role of re-design for Additive Manufacturing on the Process Environmental Performance
Abstract: At present, economic and technological design criteria for products and processes should be matched with the minimization of environmental impact objectives. Manufacturing, material production, and product design are strictly connected stages. The choice of a production system over another could result in significant material and energy/resource savings, particularly if the component has been properly designed for manufacturing. In this scenario, Additive Manufacturing, which has been identified as a potential disruptive technology, gained an increasing interest for the creation of complex metal parts. The paper focuses on the tools, based on the holistic modelling of additive and subtractive
approaches, which could be used to identify the production route allowing the lowest energy demand or CO2 emissions. The models account for the main process variables as well as the impacts due to the re-design for AM for the creation of components made of Ti-6Al-4V.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/11583/27068052018-01-01T00:00:00Z